Christopher Kyba is a physicist at the GFZ German Research Centre for Geosciences. His work is centered on quantifying artificial light in the outdoor environment, using instruments ranging from satellites to the human eye. His work frequently involves collaboration with non-academic scientists and members of the public, and he has led the development of several citizen science apps, including Nachtlichter and the Loss of the Night app. Christopher graduated from the University of Alberta in 2000 and obtained a PhD in particle physics from the University of Pennsylvania in 2006. His research has been recognized with the Leon Gaster Award from the Society of Light and Lighting in 2022 and the Galileo Award from the International Dark-Sky Association in 2016.